International Business Machines Corporation
Multilayered magnetic free layer structure for spin-transfer torque (STT) MRAM

Abstract:

A multilayered magnetic free layer structure is provided that includes a first magnetic free layer and a second magnetic free layer separated by a non-magnetic layer in which the second magnetic free layer is composed of a M.sub.1/M.sub.2 superlattice structure or a M.sub.1/M.sub.2 multilayer structure, wherein M.sub.1 is a first magnetic metal selected from the group consisting of cobalt (Co), iron (Fe) and alloys thereof, and M.sub.2 is a second magnetic metal selected from the group consisting of platinum (Pt), palladium (Pd), nickel (Ni), rhodium (Rh), iridium (Jr), rhenium (Re) and alloys thereof.